Most of the intestinal stenosis caused by radiotherapy for gastric cancer can be recovered after internal medicine treatment, while a few patients who cannot recover need to be treated by surgery. Most of the intestinal stenosis caused by radiotherapy for gastric cancer is due to radiation enteritis caused by radiation damage to intestinal tract. Radiation damage to intestinal mucosa causes congestion and edema of the mucosa, which may easily lead to intestinal stenosis. Generally speaking, after suspending radiotherapy and giving anti-inflammatory and rehydration treatments, the intestinal stenosis will be obviously improved. After radiotherapy, some gastric cancer patients may suffer from ischemia or fibrosis of intestinal mucosa due to radiation damage, and the intestinal stenosis caused by this condition will often lead to intestinal obstruction, which is generally ineffective in internal medicine, and some patients need to be discharged from the obstruction through surgery, so that the intestinal stenosis situation can be improved. It is recommended that patients seek timely medical attention and active treatment to avoid delays.